TY - JOUR
T1 - Integrated collector storage solar water heater under partial vacuum
AU - Souliotis, Manolis
AU - Papaefthimiou, Spiros
AU - Caouris, Yiannis
AU - Zacharopoulos, Aggelos
AU - Quinlan, Patrick
AU - Smyth, Mervyn
PY - 2017/11/15
Y1 - 2017/11/15
N2 - The work focuses on the experimental study of the heat diode mechanism in an Integrated Collector Storage Solar Water Heater (ICSSWH) for domestic applications. The solar device combines a horizontal cylindrical vessel with an asymmetric reflector trough (Compound Parabolic Concentrator e CPC). The cylindrical storage tank comprises two concentric cylindrical vessels: the outer absorbing vessel and the inner storage vessel. The annulus between the cylindrical vessels is partially depressurized and contains a small amount of water serving as Phase Change Material (PCM), which changes phase (mainly at low temperatures) thus producing vapor and creating a thermal diode transfer mechanism from the outer to the inner surfaces of the vessels. Several experimental results, including uncertainty analysis, are demonstrated through diagrams depicting temperature variations, mean daily efficiency and thermal losses coefficient. Additionally results from the variation of the temperature and the total pressure inside annulus are also presented. The results clearly show that the vapor's pressure plays the most important role regarding the thermal performance of the device.
AB - The work focuses on the experimental study of the heat diode mechanism in an Integrated Collector Storage Solar Water Heater (ICSSWH) for domestic applications. The solar device combines a horizontal cylindrical vessel with an asymmetric reflector trough (Compound Parabolic Concentrator e CPC). The cylindrical storage tank comprises two concentric cylindrical vessels: the outer absorbing vessel and the inner storage vessel. The annulus between the cylindrical vessels is partially depressurized and contains a small amount of water serving as Phase Change Material (PCM), which changes phase (mainly at low temperatures) thus producing vapor and creating a thermal diode transfer mechanism from the outer to the inner surfaces of the vessels. Several experimental results, including uncertainty analysis, are demonstrated through diagrams depicting temperature variations, mean daily efficiency and thermal losses coefficient. Additionally results from the variation of the temperature and the total pressure inside annulus are also presented. The results clearly show that the vapor's pressure plays the most important role regarding the thermal performance of the device.
KW - heat diode
KW - ICSSWH
KW - Compound Parabolic Concentrator
KW - Phase Change Material
KW - pressure
UR - https://pure.ulster.ac.uk/en/publications/integrated-collector-storage-solar-water-heater-under-partial-vac
U2 - 10.1016/j.energy.2017.08.074
DO - 10.1016/j.energy.2017.08.074
M3 - Article
VL - 139
SP - 991
EP - 1002
JO - Energy
JF - Energy
ER -